mirror of https://github.com/tailscale/tailscale/
net/dns: split resolvconfManager into a debian and an openresolv manager.
Signed-off-by: David Anderson <danderson@tailscale.com>pull/1691/head
parent
5480189313
commit
58760f7b82
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// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package dns
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import (
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"bytes"
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"fmt"
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"os/exec"
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)
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// resolvconfIsOpenresolv reports whether the `resolvconf` binary on
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// the system is the openresolv implementation.
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func resolvconfIsOpenresolv() bool {
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bs, err := exec.Command("resolvconf", "--version").CombinedOutput()
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if err != nil {
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// Either resolvconf isn't installed, or it's not openresolv.
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return false
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}
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return bytes.Contains(bs, []byte("openresolv "))
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}
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// openresolvManager manages DNS configuration using the openresolv
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// implementation of the `resolvconf` program.
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type openresolvManager struct{}
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func newOpenresolvManager() openresolvManager {
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return openresolvManager{}
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}
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func (m openresolvManager) SetDNS(config OSConfig) error {
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var stdin bytes.Buffer
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writeResolvConf(&stdin, config.Nameservers, config.SearchDomains)
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cmd := exec.Command("resolvconf", "-m", "0", "-x", "-a", "tailscale")
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cmd.Stdin = &stdin
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out, err := cmd.CombinedOutput()
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if err != nil {
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return fmt.Errorf("running %s: %s", cmd, out)
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}
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return nil
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}
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func (m openresolvManager) SupportsSplitDNS() bool {
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return false
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}
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func (m openresolvManager) GetBaseConfig() (OSConfig, error) {
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return OSConfig{}, ErrGetBaseConfigNotSupported
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}
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func (m openresolvManager) Close() error {
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cmd := exec.Command("resolvconf", "-f", "-d", "tailscale")
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out, err := cmd.CombinedOutput()
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if err != nil {
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return fmt.Errorf("running %s: %s", cmd, out)
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}
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return nil
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}
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